help with Physic homework question ?? Watch

plstcpoke
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A spaceship goes past a planet at a speed of 0.80c. An observer on the planet measures the length of themoving spaceship as 40 m. He also says that his planet has a diameter of 2.0x106m.
a) How long does the woman on the spaceship measure the ship to be?
b) What does the woman on the spaceship measure the diameter of the planet to be?
c) According to the man on the planet, the spaceship takes 8.0 s to reach the next planet in his solar system. How long would the woman on the spaceship say it took?
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Joinedup
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(Original post by plstcpoke)
A spaceship goes past a planet at a speed of 0.80c. An observer on the planet measures the length of themoving spaceship as 40 m. He also says that his planet has a diameter of 2.0x106m.
a) How long does the woman on the spaceship measure the ship to be?
b) What does the woman on the spaceship measure the diameter of the planet to be?
c) According to the man on the planet, the spaceship takes 8.0 s to reach the next planet in his solar system. How long would the woman on the spaceship say it took?
These are questions about relativistic time dilation and length contraction... Have you looked at any special relativity formulas?

http://ocw.mit.edu/high-school/physi...y_topicssr.pdf
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